Telegram Desktop Portable 1.2.0 Rev 2 has been released. Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed. It's packaged in PortableApps.com Format so it can easily integrate with the PortableApps.com Platform. And it's open source and completely free.
Revision 2 fixes an issue with the stored settings being placed in the application's folder instead of Data